Cook the dried lentils according to the package. Set them aside to cool completely.
To a bowl, combine all ingredients for the patties with the cooked red lentils. NOTE: you may need to add more flaxseed/or flour as needed. Make patties out of the mixture.
Heat a cast iron skillet with coconut oil and cook the patties for 4-5 minutes each side. May cover with a lid while cooking.
Meanwhile, mix all Herbed Yogurt ingredients together in a bowl.
Remove patties from the skillet and let them cool for a few minutes. Serve on a bun with the Herbed Yogurt Sauce. Enjoy!